Loss of water pressure on manual gravity feed shower

[kevin12345]

Hi,
I have a thermostatic ensuite gravity feed shower. I fitted it as a replacement about 2 years ago.
It has never been very powerful ( about as strong as a watering can but in the last couple of weeks the shower starts fine as usual power then within a couple of minutes the flow reduces by about 50%. It still keeps the same temperature but flow is rubbish.
Turn it off for a minute then turn back on and it's fine again for a minute then slows again.
I have made sure the head is not full of lime scale.
Im in the process of thinking of fitting whole house pump to increase pressure all over the house but wondered if the shower pressure problem might be something else?

 

[seco services]

Does it still reduce if you run the shower on fully cold or fully hot ?

 

[henry13]

I would imagine that there is an eventual temperature drop in the hot water supply, so to maintain the same temperature at the shower, the mixer thermostat reduces cold water flow... possibly shutting it off completely - so you only get a dribble.

 

[Hugh Jaleak]

Check any filters fitted in the inlets to the shower, if these are clean then check pipework. Maybe worth disconnecting the shower from the supplies and then turn the supplies on individually and see if the flow subsides, indicating a restriction in the supplies.

 

[tincup]

Hi
After you 've checked the filters on the shower.
I'd have the neck of the hot water tank off to be sure it is free of limescale before i fitted a pump to it.